KR20050062144A - Apparatus controlling washing flow in the dishwasher - Google Patents

Abstract

The present invention relates to a dishwasher, and more particularly, to a flow path switching device of the dishwasher to prevent all the main flow path is closed when the valve is rotated, and to prevent a large pressure acting on the dirt chamber.

To this end, the present invention is the flow path switching motor (51); A washing water inlet 61 through which the washing water pumped from the sump flows into: a main flow passage 62 or 63 branched from the washing water inlet to be connected to each injection arm; A drive cam 66 installed to rotate as the flow path switching motor 51 is operated; The valve 67 is rotatably installed in the washing water inlet 61 and the branch of the main flow path, and is installed to open and close a predetermined main flow path (62, 63) by being rotated by the drive cam 66. It provides a flow path switching device of the dishwasher comprising :.

Description

Euro switching device in dishwasher {apparatus controlling washing flow in the dishwasher}

The present invention relates to a dishwasher, and more particularly to a flow path switching device of the dishwasher.

Hereinafter, a conventional dishwasher will be described with reference to FIGS. 1 to 5b.

1 is a configuration diagram schematically showing a configuration of a conventional dish washer, Figure 2 is an exploded perspective view showing the water collecting device of Figure 1, Figure 3 is a top view showing the structure of the filtering housing constituting the water collecting device of FIG. 4 is a state diagram showing a state in which the washing water flows in the water collecting device of FIG. 2, FIG. 5A is a state diagram showing the flow state of the washing water flowing into the lower injection arm from the filtering housing of FIG. 2, and FIG. If the main flow path of the filtering housing is blocked is a state diagram showing the flow state of the wash water.

Referring to FIG. 1, a water collecting device 1 is installed at an inner lower side of the dishwasher. Upper / lower connecting pipes 2.3 are respectively connected to the water collecting device 1, and upper / lower injection arms 4 and 5 are connected to the upper / lower connecting pipes 2.3, respectively. In addition, the lower arm (3) is connected to the washing arm (8).

The upper and lower injection arms 4 and 5 are rotatably installed on the top of the water collecting device 1. In this case, a plurality of injection holes are formed in the upper / lower injection arms. These injection holes are formed to be able to spray the washing water at an angle. Accordingly, each washing arm is rotated in response to the spraying force of the washing water when the washing water is injected from each of the spraying arms.

The upper rack 6 is provided on the upper part of the upper injection arm 4, and the lower rack 7 is provided on the upper part of the lower injection arm 5. At this time, the upper rack and the lower rack is formed to accommodate dishes.

Accordingly, the washing water pumped from the water collecting device 1 is selectively or simultaneously introduced into the upper and lower injection arms 4 and 5 and sprayed into the upper and lower racks 6 and 7. Accordingly, the dishes in the upper / lower racks are washed. The washing water in which the dishes are washed is collected again by the water collecting device 1 installed at the lower portion.

Referring to FIG. 2, the water collecting device 1 includes a sump 11, a pumping motor 12, a flow path switching motor 13, a heater 14, a rotor 15, a valve 16, and a filtering housing. And a filtering panel 27.

The sump 11 is formed with a predetermined space to collect the washing water therein. A pumping motor 12 and a flow path switching motor 13 are installed below the sump.

In the sump, a heater 14 is installed to heat the washing water, and a filtering housing 20 is installed above the heater.

A rotary wheel 15 is installed below the filtering housing, and the rotary wheel is axially coupled to the pumping motor 12. As the pumping motor is operated, the rotor 15 rotates to pump the wash water collected in the sump 11 into the filtering housing 20.

In addition, a valve 16 is installed in the filtering housing 20, and the valve 16 is axially coupled to the flow path switching motor 13. Such filtering housings and valves will be described in detail below.

The filtering panel 27 is installed above the filtering housing 20. In this case, the filtering housing is installed to be located approximately at the center of the filtering panel.

The filtering panel is generally formed in a disc shape and installed to cover the upper end of the sump 11. In this case, a plurality of drain holes 28 are formed at the edge of the filtering panel, and a filter 29 having a predetermined mesh to correspond to the dirt chamber 26 of the filtering housing 20 at the center of the drain holes. ) Are installed about three.

At this time, the drain hole 28 performs a function of collecting the washing water dropped from the upper and lower racks 6 and 7 to the sump 11 again. In addition, the filter 29 filters the dirt, such as food waste contained in the wash water.

This filter 29 interferes with ringing of the filter 29. The washing arm 8 installed on the upper side of the filtering panel 27 sprays the washing water onto the filter 29 as shown in FIG. Drop it.

Referring to FIG. 3, the filtering housing 20 has a washing water inlet 21 formed therein so that the washing water pumped from the rotary car 15 is introduced, and the washing water inlet is a passage for guiding the washing water to each spray arm. Two main flow paths 22 and 23 are branched. At this time, each of the main flow paths 22 and 23 is connected to the upper and lower connection pipes 2.3.

In addition, a sampling flow passage 24 is connected to the washing water inlet 21 so that some washing water flows in, and a waste chamber 26 is connected to the sampling flow passage.

The sampling flow passage 24 is provided with a pollution degree sensor 25 to measure the contamination of the washing water. The pollution sensor 25 measures the pollution level of the washing water by the light emitting unit and the light receiving unit.

Some washing water introduced into the sampling flow passage 24 flows into the dirt chamber 26. The wash water of the dirt chamber 26 is overflowed, and at this time, the dirt contained in the wash water is filtered out. The filtered wash water flows back into the sump 11 through the drain hole 28 of the filtering panel.

In addition, a drain hole 26a is formed in a predetermined portion of the dirt chamber 26, and the drain hole 26a is located at the sump 11. At this time, the opening and closing structure is installed in the drain port 26a of the dirt chamber.

Meanwhile, a valve 16 is rotatably installed at the washing water inlet 21, and a flow path switching motor 13 is axially coupled to the valve 16. At this time, the flow path switching motor rotates the valve only in one direction. Opening and closing ribs 16a are formed in the valve 16 to close the main flow passages 22 and 23.

Therefore, as the flow path switching motor 13 rotates, the main flow paths 22 and 23 are selectively opened or closed.

Referring to the operation of the dishwasher configured as described above are as follows.

The dishwasher washes the dishes while sequentially or selectively performing pre-washing, main washing, rinsing, heating rinsing and drying. A drain stroke is performed between each of these strokes. Hereinafter, the main washing operation will be described.

When the main washing stroke is started, the rotary car 15 is rotated as the pumping motor 12 is rotated. Such a rotation difference 15 pumps the washing water (including the detergent) of the sump 11 into the filtering housing 20 as shown in FIG. 4, and the washing water flows into the washing water inlet 21 of the filtering housing 20.

Subsequently, as the flow path switching motor 13 is rotated, the valve 16 selectively opens or closes the two main flow paths 22 and 23.

In this case, a part of the washing water flows into the upper and / or injection arms through the main flow passages 22 and 23, and at the same time, a part of the washing water flows into the waste chamber 26 through the sampling flow passage 24.

First, a case in which a part of the washing water flows into the injection arm through the main flow path will be described.

For example, in the case where only the upper rack 6 contains dishes, the valve 16 is rotated to close the main flow passages 22 and 23 to which the opening and closing rib 16a is connected to the lower injection arm as shown in FIG. 3. do. Therefore, the washing water introduced into the washing water inlet 21 is supplied to the upper injection arm (4).

In addition, when the dishes are contained only in the lower rack 7, the valve 16 is rotated to close the main flow passages 22 and 23 to which the opening and closing rib 16a is connected to the lower injection arm as shown in FIG. 5A. do. Therefore, the washing water introduced into the washing water inlet 21 is supplied to the lower injection arm 5.

In addition, when the tableware is contained in the upper and lower racks 6 and 7, all of the main flow passages 22 and 23 may be opened so that the washing water is supplied to both the upper and lower spray arms 4 and 5. Therefore, the washing water introduced into the washing water inlet 21 is simultaneously supplied to the upper and lower spray arms.

Washing water supplied to the upper or lower spray arm is sprayed on the upper or lower rack to wash the dishes.

Subsequently, the washing water having washed the dishes falls on the filtering panel 27, and the washing water is recovered to the sump 11 through the drain hole 28 of the filtering panel 27.

Next, a case in which the remaining part of the washing water flows into the waste chamber 26 through the sampling flow passage 24 will be described.

A portion of the washing water always flows into the sampling flow passage 24 regardless of which of the main flow passages 22 and 23 the valve 16 opens.

In this case, the pollution degree sensor 25 measures the degree of contamination of the washing water and transmits the information to the controller, and the control unit opens and closes the drain 26a of the dirt chamber 26 according to the degree of contamination of the washing water. After draining the washing water, the washing water is replenished as much as the draining water.

The washing water of the sampling flow passage 24 is introduced into the waste chamber 26 through the contamination sensor 25, and the washing water overflows through the filter 29 located above the waste chamber 26. At this time, the filter 29 filters out foreign substances contained in the washing water. The filtered wash water flows back into the sump 11 through the drain hole 28 of the filtering panel 27.

The filtered wash water seems to be partially filtered for a short time, but almost all of the wash water is filtered during the main washing process.

However, the dishwasher has the following problems.

First, since the flow path switching motor rotates the valve only in one direction, the opening / closing rib of the valve closes the two main flow paths in a predetermined rotation section as shown in FIG. 5B. At this time, since all the washing water in the washing water inlet flows into the waste chamber through the sampling flow path, there is a problem in that the water pressure acts momentarily on the waste chamber.

Second, if the hydraulic pressure is largely applied to the dirt chamber, the drainage opening of the dirt chamber may be opened, and the washing water may be wasted.

Third, when the hydraulic pressure is largely applied to the dirt chamber, the dirt chamber has a problem that the pollutant sensor may misjudge the pollution level as shown in FIG.

Fourth, if the water pressure acts largely on the dirt chamber in a state in which the filter is blocked by food waste, fatigue accumulates in the filter and deforms.

Fifth, when the main flow path is closed, there is a problem that the noise is greatly generated by the idling of the rotary car.

In order to solve the above problems, the present invention prevents all the main flow path is closed when the valve is rotated, preventing the large pressure acting on the dirt chamber, the flow path switching device of the dishwasher to prevent waste of washing water The purpose is to provide.

In order to achieve the above object, the present invention is a flow path switching motor; A washing water inlet for introducing washing water pumped from the sump; A main flow passage branched to be connected to each spray arm from the washing water inlet; A drive cam installed to rotate as the flow path switching motor is operated; And a valve rotatably installed at the branch of the washing water inlet and the main flow passage, the valve being installed to open and close a predetermined main flow passage by being rotated by the drive cam. To provide.

The valve is preferably installed to rotate at a predetermined rotation angle range.

At this time, the valve is more preferably installed to rotate in both directions.

The valve includes a valve body having opening and closing ribs to open and close the main flow path of the washing water inlet, and a guide member fixed to the valve body and coupled to the driving cam to rotate the valve body as the driving cam rotates. It is configured by.

A fastening portion is formed at a predetermined portion of the drive cam, and the fastening portion of the drive cam is slidably fastened to the guide member.

On the other hand, it is preferable that the opening and closing detection device is further installed to determine which flow path the valve is opened and closed as the drive cam is rotated.

The open / close detection device includes an open / close detection unit pressurized by the drive cam in a predetermined rotation angle range of the drive cam; A lever connected to the opening and closing detection unit; A switch pressurized / released as the lever is pressed / released; And, it is configured to include a control unit that is installed to determine the opening and closing state of the main flow path as the switch is pressed / released.

Hereinafter, a flow path switching device of the dish washing machine according to the present invention will be described with reference to FIGS. 6 to 10.

Figure 6 is a block diagram showing a flow path switching device of the washing machine according to the present invention, Figure 7 is a block diagram showing an embodiment of a filtering housing constituting the flow path switching device of Figure 6, Figure 8 is a flow path switching device of FIG. It is a block diagram which shows the modification of the filtering housing which comprises.

6 and 7, the flow path switching device includes a flow path switching motor 51, a filtering housing 60, a drive cam 66, and a valve 67.

The flow path switching motor 51 is installed in a sump (see FIG. 2) installed inside the dish washing machine.

The filtering housing 60 is installed inside the sump. A washing water inlet 61 is formed in the filtering housing 60 so that the washing water pumped from the sump flows in. The main flow paths 62 and 63 are branched to the washing water inlet 61 so as to be connected to the respective injection arms. The connection pipes 2 and 3 (see FIG. 1) are respectively connected to each of the main flow paths, and the respective injection arms 4 and 5 are connected to the connection pipes.

The main flow paths 62 and 63 are formed as many as the number of injection arms installed in the dishwasher. For example, when upper and lower injection arms are formed as shown in FIG. 1, two main flow paths 62 and 63 are formed.

In addition, a sampling flow path 64 is formed at a predetermined portion of the washing water inlet 61, the sampling flow path 64 is connected to the waste chamber 65, and the drain chamber 65 has a drainage port 65a. Is formed. The opening and closing structure is installed in the drainage port so as to drain the wash water including the dirt, and the pollution flow sensor 64a is installed in the sampling flow path 64.

The filtering panel 27 (see FIG. 2) is installed above the filtering housing 60. A plurality of drain holes 28 are formed at the edge of the filtering panel, and a filter 29 having a predetermined mesh is installed at the center of the drain holes. In this case, the filtering housing 60 is installed under the filters located at the center of the filtering panel.

The drive cam 66 is installed to rotate as the flow path switching motor 51 operates. That is, the drive cam 66 is axially coupled to the rotation shaft of the flow path switching motor 51 as shown in FIG.

The valve 67 is rotatably installed in the wash water inlet 61. The valve 67 is installed to selectively open or close the predetermined main flow paths 62 and 63 by being rotated by the drive cam 66.

At this time, the valve 67 is more preferably installed to rotate in a predetermined rotation angle range. The reason for this is to prevent the main body from being closed by rotating the valve when pumping the washing water, thereby preventing an increase in the water pressure in the dirt chamber 65 in an instant.

More preferably, such a valve is rotated in both directions.

The valve comprises a valve body 68 and a guide member 69.

Opening and closing ribs 68a are formed in the valve body 68 to open and close the main flow paths 62 and 63 of the washing water inlet 61. Such opening and closing ribs are preferably formed slightly longer in the circumferential direction than the main flow path.

The guide member 69 is fixed to the valve body 68 and fastened to the drive cam 66. The guide member 69 is installed to rotate the valve body 68 as the drive cam 66 is rotated.

The coupling structure of the drive cam and the valve will be described in more detail.

A fastening portion 66a is formed at a predetermined portion of the drive cam 66, and the fastening portion 66a of the drive cam 66 is slidably fastened to the guide member 69.

At this time, it is preferable that the guide hole 69a is formed in the guide member 69 along the longitudinal direction of the guide member so that the fastening part slides when the driving cam rotates. Of course, instead of the guide hole 69a, a guide groove may be formed. In addition, the drive cam may have a structure slidable to the guide member instead of the fastening portion. This sliding structure can be variously changed. Here, the guide hole and the guide groove should be formed to a length that the fastening portion can move when the drive cam is rotated.

This guide member 69 is preferably formed to extend a predetermined length outward from the valve body (68).

In addition, the fastening portion 66a is preferably formed at a predetermined portion of the edge of the drive cam 66. This is to extend the rotation angle range of the valve body when the drive cam rotates. Of course, it is also understood that the rotation section of the valve body can be adjusted by changing the position of the fastening part.

In such a flow path switching device, it is preferable to form the main flow paths 62 and 63 in the washing water inlet 61 of the filtering housing 60 within the rotation angle θ1 of the valve body 68.

At this time, the distance between the rotation center of the valve body 68 and the rotation center of the drive cam 66, and the distance between the rotation center of the drive cam 66 and the fastening portion 66a is a predetermined ratio. It is formed to have. That is, the ratio of the two distances is formed at a predetermined ratio such that the valve body 68 is rotated within a predetermined rotation angle range θ1.

For example, when the distance between the rotation center of the drive cam 66 and the fastening portion 66a is constant, if the distance between the rotation center of the valve body 68 and the rotation center of the drive cam 66 is reduced, The rotation angle range of the valve body 68 is formed wide.

In addition, when the distance between the rotation center of the valve body and the rotation center of the drive cam is constant, increasing the distance between the rotation center and the fastening portion of the drive cam, the rotation angle range of the valve body is formed wide.

 Thus, by adjusting the ratio of the two distances it is possible to adjust the rotation angle range of the valve body.

Such an installation structure of the valve body and the main flow passage will be described by way of example.

The main flow paths 62 and 63 are formed to be spaced apart by a distance W1 approximately equal to the length of the opening / closing rib 68a of the valve body 68.

For example, the main flow paths 62 and 63 are formed in a range of approximately 120 ° rotation angle θ1 with respect to the rotation center of the valve body 68 as shown in FIG. 7. At this time, the opening and closing rib 68a of the valve body is installed to rotate within a range of approximately 120 °. Thus, when the opening and closing rib 68a of the valve body is positioned between the main flow paths 62 and 63, both of the two main flow paths 62 and 63 are opened.

In addition, the main flow paths 62 and 63 may be formed to be spaced apart from each other by a distance W2 smaller than the length of the opening / closing rib 68a.

For example, as shown in FIG. 8, the main flow paths are formed in a range of approximately 80 ° with respect to the center of rotation of the valve body. At this time, the opening and closing rib 68a of the valve body is installed to rotate within a range of approximately 120 ° rotation angle θ2. Therefore, when the opening and closing rib 68a of the valve body is located at one side of the main flow paths 62 and 63, both of the two main flow paths 62 and 63 are opened.

Since the rotation angle range of the main flow path and the valve body can be variously changed, the rest of the modification will be omitted.

On the other hand, according to the rotation section of the drive cam 66, it is preferable that the opening and closing detection device 70 is further installed to determine which main flow path (62, 63) the valve 67 opened and closed. This is to more accurately determine the opening and closing of the main flow path.

The open / close detection device 70 includes an open / close detection unit 71, a lever 72, a switch 73, and a control unit 74.

The opening and closing detection unit is pressed by the drive cam at a predetermined rotation section of the drive cam 66. At this time, the drive cam is formed in a disc shape and a circular arc of a predetermined length is cut out of the edge portion, the opening and closing detection unit is installed so that the pressure is released by the cut portion 66b in a predetermined rotation section of the drive cam.

Of course, a protrusion may be formed at a position of the cutout 66b on one side of the driving cam to pressurize the open / close detection unit. It is also understood that this structure can be modified in various ways.

Both ends of the lever 72 are connected to the open / close detection unit 71 and the switch 73. This lever is provided to press the switch when the opening / closing detection section is pressed.

Therefore, as the lever 72 is pressed, the controller 74 may determine the open / close state of the main flow paths 62 and 63.

As the opening and closing detection device, a sensor including a light receiving unit and a light emitting unit may be applied. That is, a light receiving unit is installed at a predetermined portion of the drive cam, and a light emitting unit is installed around the edge of the drive cam. Accordingly, it may be determined whether the main flow paths 62 and 63 are opened or closed as the driving cam rotates.

The operation of the flow path switching device of the dish washing machine configured as described above will be described with reference to FIGS. 9A to 10B. Hereinafter, only the main cleaning operation of the washing machine will be described.

FIG. 9A is a state diagram illustrating a state in which the flow path switching device of FIG. 6 is switched to introduce the washing water into the lower injection arm, and FIG. 9B is a view of the lower injection arm washing water in the filtering housing when the flow path switching device is switched as shown in FIG. 9A. 10A is a state diagram showing a state flowing into, Figure 10a is a state diagram showing a state in which the flow path switching device of Figure 6 is switched to flow the wash water into the upper / lower injection arm, Figure 10b is a flow path switching device is switched as shown in Figure 9b In this case, the washing water flows from the filtering housing into the upper / lower injection arms.

When the main washing process of the dish washing machine is started, the rotation difference is rotated by the pumping motor to pump the washing water collected in the sump upward. The pumped wash water flows into the wash water inlet 61 of the filtering housing 60.

This washing water is partially or selectively introduced into the upper and lower injection arms, and the remaining portion is introduced into the waste chamber 65. The flow of such washing water will be described below in detail.

First, a case in which the washing water flows into the lower injection arm will be described with reference to FIGS. 6 and 7.

As the flow path switching motor 51 is operated, the drive cam 66 is rotated. At this time, the fastening portion 66a of the drive cam 66 rotates along the guide hole 69a to rotate the valve body 68.

When the valve body 68 is rotated by a predetermined angle as shown in FIG. 6, the opening and closing detecting device 70 determines that the valve body 68 opens the main flow path 62 connected to the lower injection arm, and the flow path switching motor ( Stop rotation of 51).

At this time, the opening and closing rib 68a of the valve body closes the main flow path 63 connected to the upper injection arm as shown in FIG. 7. Accordingly, a part of the washing water of the washing water inlet 61 is introduced into the lower injection arm through the main flow path 62, and the remaining part is introduced into the waste chamber 65 through the sampling flow path 64.

 Second, a case in which the washing water flows into the upper injection arm will be described with reference to FIGS. 9A and 9B.

When the valve body 68 is rotated by a predetermined angle as shown in FIG. 9A, the opening and closing detecting device determines that the valve body 68 opens the main flow path 63 connected to the upper injection arm, Stop the rotation

At this time, the opening and closing rib 68a of the valve body 68 closes the main flow path 63 connected to the lower injection arm as shown in FIG. 9B. Accordingly, a portion of the washing water of the washing water inlet 61 is introduced into the upper injection arm through the main flow passage 63, and the remaining portion is introduced into the waste chamber 65 through the sampling passage 64.

Third, a case in which the washing water flows into the upper / lower injection arms will be described with reference to FIGS. 10A and 10B.

When the valve body 68 is rotated by a predetermined angle as shown in FIG. 10A, the opening / closing detecting device determines that the valve body 68 opens the main flow paths 62 and 63 connected to the upper and lower injection arms, and the flow path switching motor. The rotation of 51 is stopped.

At this time, the opening and closing rib 68a of the valve body 68 is located between the two main flow paths 62 and 63 as shown in FIG. 10B. Accordingly, a part of the washing water of the washing water inlet 61 is introduced into the upper and lower injection arms through the two main flow paths 62 and 63, and the remaining part of the washing water 65 through the sampling flow path 64. Flows into.

As such, even though the drive cam is rotated in only one direction by the drive cam and the valve, the valve opens and closes the rotation main flow path in both directions within a predetermined rotation section.

As described above, the flow path switching device of the dish washing machine according to the present invention has the following effects.

First, by preventing the opening and closing ribs of the valve to close all the main flow path, there is an effect that can prevent the large pressure acts momentarily in the dirt chamber.

Second, since a substantially uniform water pressure acts on the dirt chamber, the drainage port of the dirt chamber is opened to prevent waste water from wasting.

Third, by preventing the wash water of the dirt chamber from flowing back to the pollution degree sensor side, it is possible to reduce the probability that the pollution degree sensor may misjudge the pollution degree.

Fourth, by preventing the hydraulic pressure is largely formed in the dirt chamber, it is possible to prevent the filter from accumulating due to fatigue and deformation.

Fifth, by preventing all the main flow path is closed, there is an effect that the noise is reduced by preventing the rotation difference is idle.

Sixth, by opening and closing the main flow path by the action of the valve and the drive cam, there is an effect that can significantly reduce the malfunction compared to the valve conventionally coupled to the flow path switching motor.

1 is a configuration diagram schematically showing the configuration of a conventional dish washer.

2 is an exploded perspective view showing the water collecting device of FIG.

3 is a top view showing the structure of the filtering housing constituting the water collecting device of FIG.

Figure 4 is a state diagram showing a state in which the washing water flows in the collecting device of FIG.

Figure 5a is a state diagram showing the flow of washing water flowing into the lower injection arm in the filtering housing of Figure 2;

Figure 5b is a state diagram showing the flow of washing water when the main flow path of the filtering housing of Figure 2 blocked.

Figure 6 is a block diagram showing a flow path switching device of the washing machine according to the present invention.

7 is a block diagram showing an embodiment of a filtering housing constituting the flow path switching device of FIG.

8 is a configuration diagram showing a modification of the filtering housing constituting the flow path switching device of FIG. 6.

9A is a state diagram illustrating a state in which the flow path switching device of FIG. 6 is switched to introduce washing water into the lower injection arm.

Figure 9b is a state diagram showing a state in which the washing water flows into the lower injection arm in the filtering housing when the flow path switching device is switched as shown in Figure 9a.

10A is a state diagram illustrating a state in which the flow path switching device of FIG. 6 is switched to introduce washing water into the upper and lower injection arms.

Figure 10b is a state diagram showing a state in which the washing water flows into the upper / lower injection arm in the filtering housing when the flow path switching device is switched as shown in Figure 9b.

Explanation of symbols on the main parts of the drawings

50: flow path switching motor 60: filtering housing

61: washing water inlet 62,62a, 63,63a: main flow path

64: sampling flow path 65: dirt chamber

65a: drain port 66: drive cam

66a: fastening portion 66b: incision portion

67 valve 68 valve body

68a: opening and closing rib 69: guide member

69a: guide hole 70: opening and closing detection device

71: opening and closing detection unit 72: lever

73: switch 74: control unit

Claims (13)

Flow path switching motor; A washing water inlet for introducing washing water pumped from the sump; A main flow passage branched to be connected to each spray arm from the washing water inlet; A drive cam installed to rotate as the flow path switching motor is operated; And, And a valve rotatably installed at the branch of the washing water inlet and the main flow path, the valve being installed to open and close a predetermined main flow path by being rotated by the drive cam. The method of claim 1, The valve is a flow path switching device of the dishwasher, characterized in that installed to rotate in a predetermined rotation angle range. The method of claim 2, The valve is: A valve body having an opening and closing rib formed to open and close the main flow path of the washing water inlet; And, The guide member is fixed to the valve body, is coupled to the drive cam to rotate the valve body as the drive cam is rotated: comprising a flow path switching device of the dishwasher. The method of claim 3, A predetermined portion of the drive cam is formed, The flow path switching device of the dishwasher, characterized in that the fastening portion of the drive cam is slidably fastened to the guide member. The method of claim 4, wherein The guide member is a flow path switching device of the dishwasher, characterized in that the guide hole is formed along the longitudinal direction of the guide member so as to slide the fastening portion of the drive cam. The method of claim 4, wherein The distance between the rotation center of the valve body and the rotation center of the drive cam, and the distance between the rotation center of the cam and the fastening portion, is formed to have a predetermined ratio to be rotated within the rotation angle range of the valve body. Euro switching device of the dishwasher. The method of claim 6, The main flow path is a flow path switching device of the dishwasher, characterized in that spaced apart at approximately the same interval as the length of the opening and closing ribs of the valve body. The method of claim 7, wherein The main flow passages are formed in a range of approximately 120 ° from the center of rotation of the valve body, Opening and closing ribs of the valve body is a flow path switching device of the dishwasher, characterized in that installed so as to rotate in the range of approximately 120 °. The method of claim 6, The main flow path switching device of the dishwasher, characterized in that formed at intervals smaller than the length of the opening and closing ribs of the valve body. The method of claim 9, The main flow passages are formed in a range of approximately 80 ° from the center of rotation of the valve body, Opening and closing ribs of the valve body is a flow path switching device of the dishwasher, characterized in that installed so as to rotate in the range of approximately 120 °. The method according to any one of claims 1 to 10, And an opening / closing detection device is further installed to determine which flow path the valve has opened and closed as the drive cam is rotated. The method of claim 11, The opening and closing detection device is: An opening / closing sensing unit pressurized by the driving cam in a predetermined rotation angle range of the driving cam; A lever connected to the opening and closing detection unit; A switch pressurized / released as the lever is pressed / released; And, Control unit is installed to determine the opening and closing state of the main flow path as the switch is pressed / released: a flow path switching device of the dishwasher comprising a. The method of claim 12, The drive cam is a circular arc of a predetermined length is cut out of the edge portion, The opening and closing detection unit is a flow path switching device of the dishwasher, characterized in that the pressure is released by the incision in the predetermined rotation angle range of the drive cam.